

class MyThread2 extends Thread{
	@Override
	public void run() {
		while(true) {
			System.out.println("hello world!");
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		
	}
}



public class Demo2 {
	public static void main(String[] args) {
		Thread t = new MyThread2();
		t.start();
		
		while(true) {
			System.out.println("hello main");
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}

}











